Are there standards for marking steel pipes?
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Seamless steel pipes are denoted as Φ108×4, while galvanized steel pipes are marked as DN100. Is there any standard regulation for the notation of steel pipes?
Seamless steel pipes can be denoted as Φ108×4, while galvanized steel pipes can be denoted as DN100 – both notations are acceptable and there is no conflict between them. There are standard regulations for marking steel pipes: one is to indicate the outer diameter, and the other is to indicate the nominal diameter.
It should be the outer diameter multiplied by the wall thickness, along with the standard for the steel pipe. Marking only DN100 does not indicate the wall thickness, which is incomplete.
The design standards for the pipes as well as the material specifications must be specified; otherwise, problems are likely to arise in the subsequent stages of work. Diameter * wall thickness – no matter who buys it, this choice is always correct ； It is also necessary to clearly state what DN100 SCH is. Especially when communicating between pipeline and electrical professionals, there can be differences in the understanding of pipe diameters.
DN100 is the nominal diameter, which only indicates this series of steel pipes. By adding the grade Sch., the steel pipe specifications can be determined. Outer diameter x wall thickness are the specification dimensions. These two seem to be used in different scenarios; if you are designing a pipe fitting, then it would naturally be DN100, Sch. If a detailed list is to be prepared, then the outer diameter x wall thickness is naturally used
Regarding this thickness issue, according to the national standards for galvanized pipes, pipes with DN100 size are specified to have a thickness of 4.0 mm by default.